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Adapting the CROPGRO Legume Model to Simulate Growth of Faba Bean

^a Dep. of Agron., Univ. of Florida, Gainesville, FL 32611-0500
^b Departamento de Producción Vegetal: Fitotecnia, Escuela Técnica Superior de Ingenieros Agrónomos, Technical Univ. of Madrid, 28040 Madrid, Spain
^c Escuela Politécnica Superior, Departamento de Producción Vegetal, Universidad de Santiago de Compostela, Spain

View larger version (39K): [in a new window]   Fig. 1. A comparison of simulated (lines) and observed (symbols) crop biomass and pod mass as a function of days after sowing for faba bean cultivar Alameda grown in Cordoba, Spain, in (a) 1986 and (b) 1987. +N, fertilized uninoculated; -N, unfertilized inoculated.

View larger version (32K): [in a new window]   Fig. 2. A comparison of simulated (lines) and observed (symbols) pod harvest index as a function of days after sowing for faba bean cultivar Alameda grown in Cordoba, Spain, in (a) 1986 and (b) 1987. +N, fertilized uninoculated; -N, unfertilized inoculated.

View larger version (37K): [in a new window]   Fig. 3. A comparison of simulated (lines) and observed (symbols) fraction leaf and fraction stem as a function of days after sowing for faba bean cultivar Alameda grown in Cordoba, Spain, in (a) 1986 and (b) 1987. +N, fertilized uninoculated; -N, unfertilized inoculated.

View larger version (17K): [in a new window]   Fig. 4. Instantaneous daily partitioning of dry matter among vegetative components (leaf, stem, and root) of faba bean as a function of vegetative stage (number of main-axis nodes), after model calibration to observed fraction leaf and fraction stem shown in Fig. 3.

View larger version (33K): [in a new window]   Fig. 5. A comparison of simulated (lines) and observed (symbols) leaf area index as a function of days after sowing for faba bean cultivar Alameda grown in Cordoba, Spain, in (a) 1986 and (b) 1987. +N, fertilized uninoculated; -N, unfertilized inoculated.

View larger version (17K): [in a new window]   Fig. 6. A comparison of simulated (lines) and observed (symbols) leaf N concentration as a function of days after sowing for faba bean cultivar Alameda grown at Cordoba, Spain, in 1987 under two treatments (+N, fertilized and -N, unfertilized).

View larger version (18K): [in a new window]   Fig. 7. A comparison of simulated (lines) and observed (symbols) nodule mass as a function of days after sowing for faba bean cultivar Alameda grown at Cordoba, Spain, in 1987 under two treatments (+N, fertilized and -N, unfertilized).

View larger version (43K): [in a new window]   Fig. 8. Effect of sowing date on (a) simulated grain yield and (b) simulated total life cycle of faba bean cultivar Alameda grown at Cordoba, Spain; Lugo, Spain; or de Bilt, the Netherlands under nonlimiting water and nutrient conditions.